A 50 to 60 hp tractor and a heavy duty bush hog go a LONG way to improving planted pine property. Deer, turkey, everything seems to love when I go in and clear out weedy BS like sweet gum, privet, etc. At the very least you are initiating fresh growth on those plants wildlife can snack on, and often times they will use these areas to travel.

Combine some strip discing (ie run your disc over the areas that are fresh mowed) with this bush hogging and you are basically creating mini food plots for wildlife by encouraging natural weeds to sprout, many of which deer and turkey use as a vital food source. Right now when everything is starting to green up and sprout is the perfect time to mow and strip disc.

If you own the property and have money to spare then hiring a dozer to put in fire lanes and burning is also great, but that's not a "small" improvement.